ORTIIOPTERA niASMIDiE. 



431 



Fig. 53. 



ocelli are rudimental, or entirely obsolete. This is not only the case 

 in the larvae and wingless species, but also in some furnished with 

 wings ; in others, however (even closely allied to the foregoing), the 

 ocelli exist between the eyes in a triangle * ; the labrum is deeply 

 notched in front {Jig' 53. 3.) ; the jaws {Jig. 53. 4.) are strong and 

 horny, either entire at the tips, with several notches towards the base 

 of the internal margin, or deeply excavated on the inner edge, with 

 the margins toothed ; the maxillae {Jig. 53. 5.) and labium {Jig. 53. 

 G.) are formed as in the Mantidas ; but the palpi are broader and com- 

 pressed ; the internal labial lobes are shorter than the external f ; the 

 prothorax is small, not dilated at the sides, and narrower than the 

 head; the mesothorax, as well as the metathorax (in the winged 

 species), is greatly elongated, being occasionally as long as the ab- 

 domen, which is also generally long and narrow ; but in the Phylliides 

 broad and depressed. Its extremity is destitute of the articulated 

 filaments of the Mantidae, which are replaced by two inarticulated 

 plates of variable form, serving in the females for the deposition of 

 the eggs, and which, in the Australian species, acquire a great 

 length {Jig. 53. 7. extremity of body of P. (D.) Titan ? , New 

 Holland). 



The separation between the terminal thoracic and abdominal scg- 



* The absence or presence of ocelli has been adopted as one of the chief cha- 

 racters for dividing the Pliasmid;u into groups ; but, from my own observations, I 

 have little doubt that their existence in this section is sexual, the males only pos- 

 sessing them. (See Gray, in \Iag. Kat. Hist, new series, vol. i. p. 144.) 



f These details of the moutli, together with Jig. 53. 2., representing the under 

 side of the head, are taken from a fine, large, undescribed insect in my collection 

 (allied to 1'. dilatatum Shaw), being five and a half inches long. 



